linux-kernel - Re: [PATCH] Clustering indirect blocks in Ext3

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Message-ID: <20071116073716.GB17536@waste.org>
Date:	Fri, 16 Nov 2007 01:37:17 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Abhishek Rai <abhishekrai@...gle.com>,
	Andreas Dilger <adilger@....com>, linux-kernel@...r.kernel.org,
	Ken Chen <kenchen@...gle.com>,
	Mike Waychison <mikew@...gle.com>
Subject: Re: [PATCH] Clustering indirect blocks in Ext3

On Thu, Nov 15, 2007 at 11:02:19PM -0800, Andrew Morton wrote:
> On Thu, 15 Nov 2007 21:02:46 -0800 "Abhishek Rai" <abhishekrai@...gle.com> wrote:
...
> > 3. e2fsck speedup with metaclustering varies from disk
> > to disk with most benefit coming from disks which have a large number
> > of indirect blocks. For disks which have few indirect blocks, fsck
> > usually doesn't take too long anyway and hence it's OK not to deliver
> > a huge speedup there. But in all cases, metaclustering doesn't cause
> > any degradation in IO performance as seen in the benchmarks above.
> 
> Less speedup, for more-and-smaller files, it appears.
> 
> An important question is: how does it stand up over time?  Simply laying
> files out a single time on a fresh fs is the easy case.  But what happens
> if that disk has been in continuous create/delete/truncate/append usage for
> six months?

Try Chris Mason's compilebench, which is a decent aging simulation.

-- 
Mathematics is the supreme nostalgia of our time.
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